Fig. 2.

KsIAA16 gene structure, IAA degron domain mutations, phylogeny, and expression. A illustrates the gene structure of KsIAA16 spanning 4,059 bp. Boxes indicate exons, green coloration indicates the translated region, and gray coloration indicates the 5′ and 3′ UTRs, whereas lines show intron positioning. Nucleotide and amino acid differences between the sensitive (S) and resistant (R) alleles of KsIAA16 (degron domain indicated) are shown. B is a phylogenetic tree containing all of the Arabidopsis AUX/IAA proteins as well as all of the putatively orthologous kochia AUX/IAA proteins identified in the transcriptome sequences. C shows the region of interest in an alignment with the most closely related Arabidopsis homologs, with the mutation in the KsIAA16R highlighted in red. D shows the phylogenetic tree of the Arabidopsis and kochia TIR/AFB family of F-box proteins identified in the transcriptome sequences.